corp 14 vs D70 vs D70HD DRW? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

magnethead · 02-21-2007, 06:24 PM

does anybody know what RPO options had to be selected to get the different axles? I keep reading that dually's have regular corp 14 bolts, but my truck has a D70. Is the D70 specific to the camper special package?

and how can one tell the D70 and D70HD apart? I think mine's a 70 HD but the tag says rear axle rating: 7500, which is the rating for a 70.

watahyahknow · 02-21-2007, 07:17 PM

im curious about that one too .....the hd version might have a posi
http://www.chuckschevytruckpages.com/14bolt.html found a little bit of info here you might want to look further on that site

magnethead · 02-21-2007, 08:57 PM

it looks to me like the D70 is a 3.562" axle tube and HD has a 4" tube....my truck has 4"ers.

http://www.pirate4x4.com/tech/billavista/D70/D70.htm

http://coloradok5.com/forums/archive.../t-134187.html

Here's off my truck:

edman87 · 02-21-2007, 10:28 PM

I didn't know the camper special came with a d70, I thought just the cab and chassis came with the d70. Wasn't the reason for the difference the axle width? The d70 setup is 5-6 inches narrower, right?

Twisted78SS · 02-23-2007, 02:16 PM

If you pull some info off the axle, it will tell you all you need to know about it. Spicer has a good site with docs on identifying your axle. As for the RPO codes this site may help.
http://www.chuckschevytruckpages.com...s_1973-87.html

watahyahknow · 02-23-2007, 04:28 PM

http://www.700r4l60e.com/diff_ident.html

magnethead · 02-23-2007, 08:17 PM

Quote:

Originally Posted by edman87

I didn't know the camper special came with a d70, I thought just the cab and chassis came with the d70. Wasn't the reason for the difference the axle width? The d70 setup is 5-6 inches narrower, right?

i got 4 foot between wheelhouses, std width for a dually.

magnethead · 02-23-2007, 08:19 PM

that will help the most, as soon as i get the quarter inch of muck off the housing.

magnethead · 02-23-2007, 08:30 PM

Quote:

Originally Posted by Twisted78SS

If you pull some info off the axle, it will tell you all you need to know about it. Spicer has a good site with docs on identifying your axle. As for the RPO codes this site may help.
http://www.chuckschevytruckpages.com...s_1973-87.html

can you specify where? I couldn't find a single bit on dana.com.

MylilBowTie · 02-24-2007, 01:30 AM

I think the HD D70 has a larger ring gear of 11.5 instead of the 10.5

watahyahknow · 02-24-2007, 05:14 AM

http://www.chuckschevytruckpages.com/14bolt.html this is the direct link fron chucks pages

HERE IS A CLOSE-UP OF A 14 BOLT GM REAR END. IT IS IN A 1977 CHEVY K/20. IT IS A FULL FLOATING AXLE, WITH THE MASSIVE 10 1/2" RING GEAR. THE AXLE SHAFTS ARE HELD IN WITH BOLTS.
THE SMALLER 14 BOLT, WITH IT'S 9 1/2" RING GEAR, IS A SEMI-FLOATING DESIGN. IT USES C-CLIPS TO HOLD THE AXLES HAFTS IN. JUST LIKE THE 10 BOLT, AND 12 BOLT GM REARS. THIS MEANS IF YOU SNAP AN AXLE SHAFT, YOU COULD LOSE A REAR WHEEL, IF YOU WERE TO DRIVE THE VEHICLE THAT WAY. SNAP AN AXLE WITH THE FULL FLOATING DESIGN, AND IT STAYS ON THE VEHICLE.

magnethead · 02-24-2007, 08:08 PM

i got that, but what are the differences between the two D70's without popping the cover?

watahyahknow · 02-24-2007, 08:37 PM

i dunno maibe its possible to see it at the type of hubs/drumbrakes that are on the axle the semifloating desighn as far as i know have the drum over the end ov the axle the full floater will have the axle in front of the drum and you can take it out without removing the weel (s)
i still have to delve deeper intoo that foir my own truck i want to rebuild it intoo a narrow track dually (wheels inboard of the fleetside bed )

02-21-2007, 06:24 PM	#1
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	corp 14 vs D70 vs D70HD DRW? does anybody know what RPO options had to be selected to get the different axles? I keep reading that dually's have regular corp 14 bolts, but my truck has a D70. Is the D70 specific to the camper special package? and how can one tell the D70 and D70HD apart? I think mine's a 70 HD but the tag says rear axle rating: 7500, which is the rating for a 70. Last edited by magnethead; 02-21-2007 at 08:43 PM.

02-21-2007, 07:17 PM	#2
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: corp 14 vs D70 vs D70HD DRW? im curious about that one too .....the hd version might have a posi http://www.chuckschevytruckpages.com/14bolt.html found a little bit of info here you might want to look further on that site __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts

02-21-2007, 08:57 PM	#3
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: corp 14 vs D70 vs D70HD DRW? it looks to me like the D70 is a 3.562" axle tube and HD has a 4" tube....my truck has 4"ers. http://www.pirate4x4.com/tech/billavista/D70/D70.htm http://coloradok5.com/forums/archive.../t-134187.html Here's off my truck: Last edited by magnethead; 02-21-2007 at 09:05 PM.

02-21-2007, 10:28 PM	#4
edman87 junk collector Join Date: Dec 2004 Location: above Baton Rouge, LA Posts: 693	Re: corp 14 vs D70 vs D70HD DRW? I didn't know the camper special came with a d70, I thought just the cab and chassis came with the d70. Wasn't the reason for the difference the axle width? The d70 setup is 5-6 inches narrower, right? __________________ '87/89/76 K5 in progress '99 K2500 short crew '91 camaro rs '98 jeep tj '52 willys cj3a

02-23-2007, 02:16 PM	#5
Twisted78SS Wide n'Low Join Date: Jan 2007 Location: La Center, WA Posts: 1,511	Re: corp 14 vs D70 vs D70HD DRW? If you pull some info off the axle, it will tell you all you need to know about it. Spicer has a good site with docs on identifying your axle. As for the RPO codes this site may help. http://www.chuckschevytruckpages.com...s_1973-87.html

02-23-2007, 04:28 PM	#6
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: corp 14 vs D70 vs D70HD DRW? http://www.700r4l60e.com/diff_ident.html __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts

02-23-2007, 08:19 PM	#8
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: corp 14 vs D70 vs D70HD DRW? that will help the most, as soon as i get the quarter inch of muck off the housing. Last edited by magnethead; 02-23-2007 at 08:22 PM.

02-24-2007, 01:30 AM	#10
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Re: corp 14 vs D70 vs D70HD DRW? I think the HD D70 has a larger ring gear of 11.5 instead of the 10.5 __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI

02-24-2007, 05:14 AM	#11
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: corp 14 vs D70 vs D70HD DRW? http://www.chuckschevytruckpages.com/14bolt.html this is the direct link fron chucks pages HERE IS A CLOSE-UP OF A 14 BOLT GM REAR END. IT IS IN A 1977 CHEVY K/20. IT IS A FULL FLOATING AXLE, WITH THE MASSIVE 10 1/2" RING GEAR. THE AXLE SHAFTS ARE HELD IN WITH BOLTS. THE SMALLER 14 BOLT, WITH IT'S 9 1/2" RING GEAR, IS A SEMI-FLOATING DESIGN. IT USES C-CLIPS TO HOLD THE AXLES HAFTS IN. JUST LIKE THE 10 BOLT, AND 12 BOLT GM REARS. THIS MEANS IF YOU SNAP AN AXLE SHAFT, YOU COULD LOSE A REAR WHEEL, IF YOU WERE TO DRIVE THE VEHICLE THAT WAY. SNAP AN AXLE WITH THE FULL FLOATING DESIGN, AND IT STAYS ON THE VEHICLE. __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts

02-24-2007, 08:08 PM	#12
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Re: corp 14 vs D70 vs D70HD DRW? i got that, but what are the differences between the two D70's without popping the cover?

02-24-2007, 08:37 PM	#13
watahyahknow Registered User Join Date: Jul 2006 Location: the netherlands europe Posts: 4,335	Re: corp 14 vs D70 vs D70HD DRW? i dunno maibe its possible to see it at the type of hubs/drumbrakes that are on the axle the semifloating desighn as far as i know have the drum over the end ov the axle the full floater will have the axle in front of the drum and you can take it out without removing the weel (s) i still have to delve deeper intoo that foir my own truck i want to rebuild it intoo a narrow track dually (wheels inboard of the fleetside bed ) __________________ i got a job again and having fun at it too idea's for the trucks and the order of things to do are taking shape and get closer to being realized , a few more months and i be able to start building for real i complete 2 of the trucks intoo running fashion one custom and one basicly stock the thirth will be sacrificed for parts Last edited by watahyahknow; 02-24-2007 at 08:39 PM.



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